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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5f5be27013c90ccc15541f85ffbfb8a1e3966afbd33f1d5be3cb7b38a0aa2e' 
  AND token = 'foVx5adobDjw8hD0jPU6hTvmmR2G7JwTji4VRLDVnTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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