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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d0f14c2e1608de12a40c12148cd7761077ff4d06144a392c5d8308a2e108df' 
  AND token = 'N+N2DzgcxAZCkq9I2itfFWYs/n7LJABKXMiuhl52nSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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