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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda2a5efc71685f4cf215865b1393a2e7c51b1bd36b143e475f76b94c83b1ef5' 
  AND token = 'wsHEefAKSIaOChHas4gxvDh1FFLbFGNjwDx2AstP3tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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