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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60cbc012a36e7ef6fedb0a5983d72386de09c3154421d2e9d0870924aff432e' 
  AND token = '1BiJ9X2TM7bFrvgbeNJIt23LGhL0SWgyptzImzOJLV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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