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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b420b58a1553878036c13f5ff6102a6aca15d36f45bcaa401929e5aa1c9b4b' 
  AND token = '5H3qvAbtPAr4uXPM3Lduz3Sra0jb8sozswwK7hj5Grg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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