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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a092c70a7220fdf93650f67e3136e0b1c612071097a93e09b77f26c22a7a1dae' 
  AND token = '28MAgC5SnehaoaBjMYA86jieaO2av5LgUtHNrFdhFzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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