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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9f8e7a822b8d658ffcf9761f478eaeed1c3d91955b5320e5a7acd60480f2a0' 
  AND token = 'navdGLBQm8qebTy+Xa9IXsfHjRruR1PTlAZfieynfqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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