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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4eed5f2afc42dfe7268095126f3a92cf307c558b0f679d94243e4999dda132' 
  AND token = 'Xwyx7XWAHGj598RYq9XT53adTGfMxKP0DFzEXA3zF5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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