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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdadfa5e6be550875f4dba0c0e1249f504b402f7bf9f2c0fd6d350159b6f1d01' 
  AND token = '6mwRfq4dkCjO/78cweunoxKsSDowR6D3rDPQ0c/UhRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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