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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36988fb3a4e9232eb714985766d395f5852fbf91b23e13074074df77ed99ffbf' 
  AND token = 'KyLrm4YA9jyJlAS4Z/+lx3frl0/4uWaLCfPfyGPOvkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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