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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eafe4d2517d853c3a7a2ddc3ba9019c894c722fdf3a449882bcf877299edc97e' 
  AND token = 'FWQZl7kB2Vin5/+iHa08cJzNxC94VCUgjMOcHaG9CEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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