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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d89f2bbcde8840989f0e55f0945b811f1c2b8183d769355819b3730cf2e802' 
  AND token = 'Ao0GlljBRX1WnFdWzzbAKM2UfeI5FHNdWKmJgrzTXso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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