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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb13bfdd3fd2035807ba9af4a58b0f33a89437f19a93ff085c582b7507487778' 
  AND token = 'amMERK1TcqPS2n/BTZ/N6o1XqggDWv24ageCj00Ls48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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