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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6877a327173339d1188edf407517ac21b472cafffcd405421ed2d6a9bc3ba9' 
  AND token = '970MuHNsZR2tbyLJ8623+8Jldm9nfp6qY0GR6Nj4Ri8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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