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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed1c475da98f647bae53ec058f87439c360d8fbbe6ecd58e3180934f6b0240f' 
  AND token = '4AcdndHKB0/mU5jgaWJgL1BQAIyE8cOxhKwc+uVHHCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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