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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a534c6439206a2fb8cd757f53a649d69b6838a3cf2239d39ad0e4bcf3f70be2' 
  AND token = 'zoDGmSdUM7apRW1YLIRWlu2k1onhO2/IRI0cemxPXqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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