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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5db10d0d7d0f5a3605085c772be76e4e86b0ba801e25d4c172e0a08cbcc7e9' 
  AND token = 'RTzeqniIS3ZkkFNluRgXruJnVGj8Je+0fwykN79a+xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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