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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0820094d6c65ae995ea9a231855a2a0eb5c1b0e5d14ba95d95b47ab339a1ebcd' 
  AND token = 'y/T7Dnb0jfonbLwug2gJJblHxh29uYWykZllA5/Z2FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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