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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce47915e63fe36ff4e4640c58b73d5d754cbc3dab06897b9b8231ebfb6b56820' 
  AND token = 'vKTLLSnWUD9K2YH+VQuWF/H7/Zvvc7e5HLb3QupHUj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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