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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab55c4458878522a5b1e62d705344b012ccfce371a99f1d1ee3d94c21850c70' 
  AND token = '/W3sN2yzjXIBHYeRngFdjwBQeU2GrN3vN2wMeBVHAcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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