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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557b0c703fee7fecf84fd102326f2f4498a31d0dc351c612d61bb3a4683e18e9' 
  AND token = 'LLmJel2Wnfd9CeCYrUbizz66oU1CU1XSMDYejSRaft0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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