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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1cb0ec53dfc3fc538cbaabdbfbb9b4587af5e765f59b184cff2c6b8614042cf' 
  AND token = '2ic3MSgsneeOO3jaRRTQ4KgrZcE+z5KzehA61wX86Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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