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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d950be658c0b2443c2f6dd7cf587252025807a5530d075df30cf808a5e06d58' 
  AND token = 'dCD3GqQZLHCNJsFYtlz4MYV0WATFMEFPNx28V5WSCz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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