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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8994657dfb4c04fcbd804643b3d314c6216c87be036a6a0b44e1d85770ce5d1' 
  AND token = 'omIIycqqCndu5VrL4LC8wES+z/FgimIMPyDYbaUSwWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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