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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40302c4d46942e4cecbf95ddee8a69a5d3e2fc83eabcaf9753785bbfeaa7294e' 
  AND token = 'JmtfamD25eg2tB3OOhb2DzJYo3tN8+wedSm3eLkoWdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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