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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e8404d3822e3a4b389a8587897827df6fb51cb78a7e88003016a5c14ba5f83' 
  AND token = '74A+8z6gn44Dj5oPrGqlmzrf7eRczaE5etXs2BVD3CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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