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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a363e80989f3f6f0e3a6673ced5e2c69212fd99df0588c1a93f89a1e07280406' 
  AND token = 'SVE3mV6XmZuHrK1p/e+id6mn0P4ov8hZsji99x+iQgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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