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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40977d9a49c22a1d9c19bbdcd618b11280ff91eab082afda58403dcb2fb6d6e9' 
  AND token = 'FcdE11j8xxIIIcaGqv4b32YX1I1rXHkwRKiz3dxJdAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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