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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361d7adff85996871dcc11b3134e31ce3c112c10e799d9aa4db29017298766ce' 
  AND token = 'dkfT+nW6JOBhHt0zc6Oa5uQ3FLPy/1uuJbl/Y3SrOx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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