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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eab9df8694695f0f710e2ef1ff013299274f8f9e3007616bc18956c6832681f' 
  AND token = 'dtAuqTgOtFXC0mT3D40T4XzCkr7v4SmjPVstNEqdiqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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