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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2ee56fd076fd8fef2780ec47545c9ce8182d95af51c0247c27ac40bf6c874d' 
  AND token = '7DOD47jnkwzZmbnMWjw5I8rUlwy8zkIHtWJtNt3obWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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