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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb1a426c7170c11f9fb435cd9a6f2deb7ad9985510e5f4d1b32486b13a2dba9' 
  AND token = 'L4u42frIQe6xgjr/Axg+S+sMzkJgJIVbKuzbrKfO2mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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