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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c546b0273b6125dcd696ca0e92ee069b21bbb81a827402274a71a5eeca431e05' 
  AND token = 'bSeaQxSLe28G3fyRLQA83c67h0i+q2IVPKkJce66Qtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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