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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70eef4296e9181ae7a0c24c946c2f7b80630525a298d4e3e883cf60279bf3939' 
  AND token = 'JqXUZKmuwNUCEDH0GyJqywGLxslX0233Lmf6CNlFJVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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