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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7fa9775f61fa69656800ae7cd1bc6a050d0f1a41c9d06a2e8801c007e23cd9a' 
  AND token = 'jcpls0ocSKTPzyN0mSmJd7Lvui0luJ1aDAXPTSSCdqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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