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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0decb6d15da85f977364898e37be89d45cc2326175dadaed570c03ab2324bd9' 
  AND token = 'y+fExPYmiEr3OQbagEvCe94bI3BsSvf+hS4DrRiZ14U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}