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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905f6a7d5a24fab5b0f95f73706c030afeb0fef340fe99fd033a8581446754f3' 
  AND token = '+JOBQEeXK/XbH5XALrycxSg0x3Pg+FDDtzFpiivZuik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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