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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2656f076e38b975855ec278ae3a624a07c85343ae822627c1ae30114633cc32d' 
  AND token = 'ywpr/OVaRYfbgSr5Es/rjxfdw8JuVT0s5uWKJ5d4ODA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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