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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb93347b89f50ef94d8617376beacc9b9a675319f48b1b9d254e2cb9a5890d0b' 
  AND token = 'FfNEoIzuJ8gu2gFEE3aQ7wGwRcA92m6CKN7gbIS+05c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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