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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c83b2ef5ed1caeedda0367b36c6d14707cd27dd72d7b7159434520c9a5c2ca7' 
  AND token = 'tqhp4uScb58ojDnUrkoHtuaApVAMbIHGlMcd4A+Lz5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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