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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb17a5ebcb1d2d212ef0622f8d0a5c5f6e7162d75a3e1cd388e20a16059e3ddf' 
  AND token = 'FCZ0x2u0yd+mMsZGI6FP5LdGzE3yX3mGK4sFNMWQFBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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