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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9201a862959d5de1a4e6b51829f91229e178bb59b1654aad70aa9c252b1b7da' 
  AND token = 'SbohPWHfs5NKEZTVuEK+vBcmahwhSsuyPqYYKRUIYeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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