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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd314cf3f0f96c8045e0b1ddd760172aabd2e18c5db4657898b29e22b2e49659b' 
  AND token = 'ydfxPulhMw+y0GrKqnfAIvy8MhdLE9VTZOK6aIZR8nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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