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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff3bdeea4b3feecffc9632ab2dc74e8bd0f4d306b2de43aa76ef622fa840e90' 
  AND token = 'rdWnKcxy5qTnTaM5lR8YNXP4VWCNFkZ+w2boVRG6gHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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