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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d758f58e4a20fd44851209f9389a6e8edf91015d6fe5cada0419cb2f84c59cf' 
  AND token = 'o1Rc4ScEqkFlLX0UW0unNC08GpeBcjkpCF407mHwOXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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