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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a59efa32f2aa5f53e90b3d85c1af3ee76ed8f438fd2f1996816e671d29a9a90' 
  AND token = 'tJ4R/uHO3kN/YT/QV6PKSa01sNSCNr1fpWb/P4IpxU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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