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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a3170eb80400a150844916d2a0e2b21751d7fc41cd12ca8d99791ddc71b5f0' 
  AND token = '2IJXOmtD0shko9EwUtvaCCRzN7K3I8u2Bjwoy9CBeoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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