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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795af1a91a7b3d2ba20a5d270609d419059a2c77aeee9b1780e68651045f2ad6' 
  AND token = 'yuWW18u3UcY9wcegfVbWzqXGKrl2Vzpn+vOeveO4r1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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