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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e09f80f277deaa9c6b955068bed2a30f6db6eeb0071030bbba5aba51ab425fd' 
  AND token = 'gObMxcj+w9oRWj0o1Aib93NYg2REObczZ8+hoZ50nho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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