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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b660ad697f8196f2f5997a5b50448c2c1e9b95c801467c64e345f5a595c72d9e' 
  AND token = 'O/xpKf+H8F3ik9KeJm/EinkYMnZXI1ul0781rKATHBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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