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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7616d2f3fcb72b8a27c6044c50a2d757dd0bbe5b3adc30e04c9425a3b8ac88' 
  AND token = '9xIQ7D2eb8GDiy4145RGdmcpyfOAx4xHjAIQ7zr59iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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