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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236f19ba0ff34b3350a7769c6e6c4c4b521cd6889038e6c1d82def7b1f84cdb9' 
  AND token = 'T271W//amGxi4mKapkpk25yrljpuGfETxZLqbRXa6rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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