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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3531f9418c04feb9ad15dc1ef5731d390bbe28ee19011e6aedb7346afdb08ad5' 
  AND token = 'ffJbeUcWYJ5poWeyxuZe5T6u6XcEYkN/RW+B5NDH1Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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