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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4ea624e4b8e0ac9ea587fc5323bdddb5aa7c9db684f2771d05f0595a54431e' 
  AND token = 'jEyYTHLfy5joOupwwxDw18GxcvQrK3ax4RIgoGxfC1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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