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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0356f08bf73726ba09d92d543f29a8df862f61c53c98ded5bcce515e702008b' 
  AND token = 'pc66i6LZZ3t2AHve+k79Gsaoj5g/1qULSHlrLcS4+L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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